With interest, the project could ultimately cost around $24 billion, finally getting paid off in 2038. Besides creating a financial nightmare, the Big Dig was plagued by huge constructional flaws – which obviously added fuel to the fiscal firestorm.
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The Central Artery/Tunnel Project was the largest, most challenging highway project in the history of the United States. It reduced traffic and improved mobility in one of America's oldest, most congested major cities. It built a framework for continued growth in Massachusetts and New England.
The National Transportation Safety Board released a report on the one-year anniversary of the disaster, that attributed the major cause of the collapse to epoxy creep.
Aggregate provided 60% of the concrete used to build the Big Dig. Indicted were: former general manager Robert Prosperi; dispatch manager Marc Blais; dispatch manager John Farrar; quality control manager McNally; district operations manager Gregory Stevenson; and dispatch manager Keith Thomas.
Planning began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007, when the partnership between the program manager and the Massachusetts Turnpike Authority ended.
The project placed 3.8 million cubic yards of concrete. That's enough to build a sidewalk three feet wide and four inches thick from Boston to San Francisco and back three times. The project installed more than 26,000 linear feet of steel-reinforced concrete slurry walls.
The Boston's Big Dig project replaced the elevated deteriorating six-lane elevated Central Artery (I-93) with an underground expressway beneath the existing road, extended the I-90 tollway underground to the South Boston Seaport and Logan International Airport, built a new 10-lane bridge over the Charles River, and ...